Grinding-machine.



F. N. & F. E. GARDNER. A. m. GARDNER, zxzcumx or r. n. GARDNER. usc'o.

GRINDING MA E. 1 APPLICATION FILED N 3.19:2.

Patented Jul 7 1916.

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I jw nionj ii; a, zom- 14' gig My iHIi F. N. & F. E. GARDNER. A. n. GARDNER. Exzcumxor r; N. GARDNER, ozc'n.

GRINDING MACHINE. APPLICATION FILED N0 V. 23' 1912.

Patented July 4, 1916.

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F. N. & F. E. GARDNER. A. m. GARDNER. EXECUTRIX or r. N. GARDNER. DEC'D. GRINDING MACHINE. APPLICATION FILED NOV. 23. I912.

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-4 I L J willzasisa JQIM zM v UNITED STATES PATENT OFFICE.

FREDERTCK N. GARDNER AND FREDERIC E. GARDNER, OF BEL'OIT, WISCONSIN, -AS- SIGNORS OE ONE-THIRD TO LOUIS WALDO THOMPSON, 0F IBELOIT, WISCONSIN;

ALICE M. GARDNER EXEGUTRIX 0E SAID FREDERICK N. GARDNER, DECEASED.

GRINDINGQMACHINE.

Specification of Letters Patent. Patented J uly 4;, 1916.

. Application filed November 23, 1912. Serial No. 733,026.

To all whom it may concern:

Be it known thatwe, FREDERICK N. GARDNER and Fennnmo E. GARDNER, citizens of the United States, residing at Beloit, in the county of Rock and State of Wisconsin,

have invented certain new and usefullm provements in Grinding-Machines, of which the 7 following is a specification.

This invention relates to machines used for grinding purposes, and more particularly that class of machines which has for its object the grindingof material by means of a roll or cylinder mounted on a rotating spindle and faced vwith sandpaper, emery cloth, or other grinding surfaces, the machine being especially adapted for use in making wood patterns.

The invention 'has for its object the production' of such a machine so constructed and with suitable attachments so arranged that curved surfaces which are either like or unlike the surface of the grinding cylinder may be conveniently, quickly and accurately ground.

It has for a further object such construction as allows the cylinder to be inclined from the vertical toward the horizontal to an extent of at least 45 in opposite directions. so that surfaces not perpendicular with the plane of the object being ground may be suitably operated upon; In previous grinding verticalroll, the work-table has been tiltable, but this arrangement has the disadvantage that the operator. is obliged, when the table is tilted, to support and move the work. upon an inclined surface. By tilting the roll, in-

' stead of the "table,the operator always has a horizontal surface on which to move the work.

Other objects of the invention will be apparent after the mechanism of the machine used to ilustrate vthe inventionis understood by consideration of the following description.

In the accompanying drawings, Figure 1 is a side view of the machine. Fig.2 is a front view of the machine. Fig. 3 is a plan machines employing a view of the work support and grinding cyl-.

inder of the machine in which the parts occupy one-relation to each other, and Fig; fl; is a smiilar viewshowin parts in anot er relation to each other.

ig. 5 is a vertical section of a portion of the work support and of the work, with the grinding cylinder adjusted vertically. Fig. 6 is a-view similar to Fig. 5 with the grinding cylinder adjusted at an angle approximately of 45?. Fig. 7 illustrates a means'for securing the cylinder to the spindle.

In general, the machine comprises a slidable support upon which the work to be operated upon is placed, above which proects the grinding rotary cylinder. Means are provided for tilting the cylinder at any angle 'up to 45, or more,w'ith the vertical, and in opposite directions, without in any way interfering with the mechanism for rotating thecylinder. vided for guiding the work as it rests upon the supporting surface so that its movement Special means are prowith relation to the grinding surface corresponds to the curved surface to be'ground. And finally, in order to vary the grinding surface so as to produce a smooth surface on the work, and also to prevent the dust and particles from clogging'the grinding surface, means are provided for oscillating the grinding cylinderspindle, and hence the cylinder itself, longitudinally as the spindle rotates. The manner in which these various operations are carried out'will scribed in detail.- I

The machine comprises a frame 10 upon which is mounted a work support 11. The support is slidably mounted on the frame by now be demeans of guides 12. A grinding roll or cylinder 13, which is mounted on the spindle 1d,

projects through the'opening 15 in the work support, and extends upwardly above the support so far as may be necessary to properly perform its function in grinding work that may be placed on the sup ort.

Mechanism provided for sultably rotating the cylinder comprises a shaft 16 mounted "in hearings in the frame 10, carrying loose and tight pulleys 17 and 18 for receiving the belt, a lever 18?, with suitable connectmg means, being lprovided for shifting the belt from one pu ey to another. .Also, fixed on the shaft 16 is a machine-driving pulley 19, adapted to ca which asses over two id e pulleys 21, journaledm the frame of the machine, and a spindle-dnvm pulley 22. This pulley 22 is fixed to a sha 23 mounted in bearings in a tubular arm or stem 24 projecting from one side of a casing 25. At the other side of the a driving belt 20 In order to vary the speed of rotation of I .20 32 which is mounted in the casii1g25 slidcash is a similar arm or stem 24'. The

A :cylin er spindle 14'is mounted in bearin s 26in the casing 25'. Fixed'to the shaft 23- 1s .a friction disk 27, and mounted on the spina,

' ma be governed by means of a set screw 29 actlng against the end of the shaft 23. i A consideration of the mechanism will show that when the driving shaft 16 is op- 'dle 14 is a friction disk 28 which is constantly in contact with disk 27 and is caused to rotate thereby whenthe machine is in o eration. The pressure between the two dis erated the pulley 22 will be rotated, causing the disks 27 and 28 to rotate and thus also the grinding cylinder 13.

the grinding cylinder means are provided for shifting the friction disk 28 with 'reference to the disk 27. These means comprise a screw shaft 31 threaded into the member spindle 14. and. the grinding cylinder 13.. "The screw 31 may be rotated in any suitable manner. Herein, for the purpose, we have provided bevel gears 33, one of which is fixed to the shaft 31, and the other of which is fixed to a shaft 34 journaled in bearings 35 fixed to the-casing 25. A hand wheel 37 is fixed to the shaft 34 so that the shaft 34 may be manually rotated.

In order to suitably incline the grinding cylinder when desired, we have provided in each side of the frame 10 of the machine an arcuate 'slot 38, the center of which lies approximate to or in the surfaceof the support 11. The arms 24 and 24 projecting.

from the casing 25 pass through these slots.

. F ix'ed to the arm 24 is a member 39 external to the frame of the machine. A clamp operated by the handle 40 is adapted to clamp in an ordinary manner the member 39 rigidly to the; frame 10. Parallel with the slot 38 is an arcuate guide bar 41 fixed to the frame of the machine. The member 39 is slidably mounted on said guide bar. Rack teeth 41 are formed in said guide bar, and meshing with these-rack teeth is a pinion 42 fixed to a shaft 43 which is journaled in the member 39. and which may be rotated by means of the hand wheel 44.

It will be seen that, by rotating the handle 44, the pinion 42 will be rotated, and,

as it meshes in the rack teeth 41", will carry the member 39 and with it the casin 25 to any'desired position, whether vertica or in-- guide bar 41".

. indicated.

firmly in the desired position by means of the handle 40.

The arm 24 is attached to a member'39 which is slidabl'y mounted on an arcuate On the member 39 is a bracket 39" in which the adjusting screw 29 is carried.

A consideration of the belt system hereinabove described will showthat with the pulleys 21 placedsymmetrical with reference to the center of the are 38 the pulley 22 is free to move along an arc concentric with the slot 38-, and .will be operated by the belt.

in any position in which it may thus be located. n order, however, to maintain constant the belt pressure there may be provided a pulley 45 which is journaled inan arm 46, pivoted to the frame of the machine, and which is yieldingly held against the belt by means of the spring 47 By thesemeans, when the pulley 22 is shifted toward either end of. the arc the pressure of the belt will be maintained as great as when inthe central position indicated in Fig. 2.

A consideration of the mechanism will show that tilting of the grinding. cylinder or roll and its spindle in the manner specified will in no way'iiiterfere with the. operating mechanism of thespindle, or with the means for varying the speed of the spindle.

So that the cylinder may be operated in the inclined to the position shown in Fig. 6 in either direction from the vertical, and may be operated at any angle between the limits In the use of grinding machines it has ordinarily been t circles, and other curves, by first laying out the curve and then grinding to the line, or by using grinding cylinders with a radius equal to the radius of the-curve to be ground. Curves ground by the latter method require necessarily a different grinding cylinder for every different radius which is to be ground. And curves ground by the former method' not only -r ire more time, both in la out the wor and in grinding to the ines drawn, but also necessarily the resulting curve is more or less inaccurate, de en upon the skill of the operator. o avoi these and other disadvantages we have rovided special means to assist in grin in curves, particularly arcs and circles whi have a radius unlike the radius of the grindin cylinder.

n the surface of the work support 11 a guide ring 48 islrotatably set in a circular oove 49. The work 50 to be operated on is attached to this rin and an suitable means may be provided t erefor. erein we have provided holes 51 in which may be set sharpened pins 52; By pressin the work 50 to be ground onto the points 0% these pins vertical position shown in Fig. 5, or may be e practice to grind arcs,

the work is non-slidably held in reference to the ring-'48. Evidently, as the, work support 11 is slida'ble with reference to the cylinder 13, the center of the ring-48 may be readily shifted with reference to the cylinder. And, by attaching the work-to be ground to the ring 48 so that the surface to be formed is concentric with the ring and then sliding the support so as to bring the surface in contact with the cylinder, rotation of the work guided by means of the ring will cause the surface to be formed to be round true by the cylinder, because the sur ace will at a 1 times be in contact with and tangent to the grinding surface. Hence, in order to produce a true are or circular surface, it is necessary only to form the surface roughly by means of a band saw or otherwise, to attach the work to the ring 48 so that the arc to be formed will be concentric to the center of the ring, to shove the work support until the surface to be ground comes in contact with the grinding surface and then to revolve the work around the ring center until the surface is completely ground. And it is evident that external parts as well as internal parts may be ground by the method already indicated.

The set screw 53 acts as a limiting stop to the movement of the work-table 11, so that when the surface is sufficiently ground the set screw will come in contact with the frame edge 54 and further movement of the work support 11 will be prevented. In order to use the device in grinding small ieces, a removable block 55 may be rovi ed to fill the greater portion of the s 0t 15 so as to prevent the work from dropping into the slot.

Any suitable means may be provided for oscillating longitudinally the grinding cylinder as it rotates to prevent the grains of abrasive material from cutting rooves in the work. Herein we have provi ed a preferred means which comprises a collar 55" fixed to the spindle 14 and having thereon an inclined annular flange 56. Fingers 57 pivoted to the casing 25 project one above and the other below the flange 56. Evidently if these fingers are rigidly fixed to the casing, as the spindle 14 rotates it will be oscillated longitudinally by means of the inclined flange 56.

As it is necessary to rotate the spindle 14 with enormous s eed, sometimes as high as twenty thousan rotations per minute, it has been found best to have the fingers yieldingly held in position, so that they may give more or less as the spindle rotates and thus prevent undue wearing and jarring of the mechanism. For this reason we not only pivot the fingers to the casing but also emloy the springs 58 to hold them yieldingly in position against the surfaces of the flange, and thus, as the spindle rotates, the fingers give so much as may be necessary to cause pro er operation of the mechanism at the ig speed required.

referably, the roll 13 is adjustable along the spindle, in order that the entire surface of the roll may be brought into use; and for the same purpose the roll may be removed from spindle, turned end for end, and re placed. The roll is secured in position by means of tapered nuts 59 turned upon the tapered hubs 60 of the roll, said hubs being slotted so that they may be clamped on the spindle by said nuts. In practice, rolls of various diameters may be provided and used upon the s indle 14.

Althoug we have described with some particularity the various details of the machine used to illustrate our invention, yet. it is evident that modifications therein may be made by those skilled in the art without rle parting from the scope of the following claims.

We claim as our invention:

1. In a rindin machine, a normally vertical grinding cylinder, manual means for inclining the axis of said cylinder, and means for rotating said cylinder, said inclining means comprising a casing, the spindle of said cylinder being journaled in said casing, a smft connected to said casing, an arcuate rack fixed to the frame of said machine, a gear wheel fixed to said shaft and meshing with said rack, and means for operating said shaft.

2. In a rinding machine, a normally vertical grinding cylinder, means for inclining the axis of said cylinder, and manual means forrotating said cylinder, said inclining means comprising a casing, the spindle of said cylinder being journaled in said casing,

a shaft connected to said casing, an arcuate rack fixed to the frame of said machine, a gear wheel fixed to said shaft and meshing with said rack, means for operating said shaft, and means for clamping said casing in its adjusted position.

3. In a grinding machine, a rotary grinding element, means for inclining said cylinder, and means for rotating said clement, said rotatin means comprising a driving shaft journa ed in the frame of said maehlne, a drrve pulley fixed to said shaft, two idle pulleys rotatably mounted in said frame and symmetrically placed with reference to said element, a fourth pulley operatively connected with the spindle of said element and positioned within the triangular space formed by said other pulleys, a belt-tightenmg pulley yleldlngly fixed to the frame of said machine, and a belt running on all of said ulleys.

4. n a grinding machine, a grinding element, means for tiltin said element, and means for rotating saic element, said rotating means comprising a driving pulley and two idle pulleys rotatably mounted in the frame of said machine, a casing tiltably mounted in the frame of said machine, the spindle of said element being journaled in said casing, a. shaft journaled in said casing; a disk fixed to one end of said shaft, a dis fixed to said s indle and frictionally in contact with saic other disk, a pulley on the other end of said shaft, and a belt adapted to run on all of said pulleys.

5. In a grinding machine, a die, and means for reciprocatin said means comprising a co ar on said spindle, an annular flange on said collar, the axis of said flange being inclined to the axis of said spindle, and a finger projecting on each side of said flange and connected to the frame of said machine.

6. In a grinding machine, a rotary spindle, and means for reciprocating the s indle, said means comprising a collar on sai s indie, an inclined annular flange on said collar, and a finger projecting on each side of said flange and pivoted to the frame of said machine, and ielding means normally holding said finger 1n contact with said flange.

rotary spinthe spindle,

mm o! mpatent my to 7 In a rinding machine, a casing, a grinding-cy inder spindle rotatably ournaled in said casing, an annular flange fixed to and concentric with said gpindle, the axis of said flange bein incline to the axis of said spindle, a yie ding member connected with said casing and projecting above said flange, .and a yielding member connected with said casing and projecting below said flange.

rm mg in l n a horizontal rinding machine, means for fiined curved surfaces, comprissupport, a rotary grinding roecting above sai support, lining said cylinder, and means movement cy inder means formc on said support for confining the of work to be ground to a com lete circle concentric with the surface to be ormed.

In testimony whereof we aflix our signatures in the presence of two witnesses.

FREDERICK N. GARDNER. FREDERIC E. GARDNER.

Witnesses:

J. 0. R000, S. W. THoMrsoN.

obtained to! in out: each, by droning the "Commissioner a! latent:- 

